Abstract: Aiming at the research of steer by wire system vehicle, the variable transmission ratio algorithm is designed based on the constant yaw rate gain method, and the algorithm is improved and revised according to its system structure and design purpose. The comprehensive evaluation index function of handling stability is selected as the objective function of the optimization algorithm, and the constant gain is optimized by the simulated annealing algorithm to obtain the global optimal value. And take the optimal value as the design basis for the final transmission ratio algorithm. Simulate analyzing the transmission ratio algorithm. The results show that the optimized transmission ratio algorithm SBW vehicle has better steering performance. And the algorithm can effectively reduce the operating burden of the driver.

Key words: Vehicle engineering; Simulated annealing; Steer-by-wire; Variable transmission ratio;Handling stability

摘要： 针对线控转向（SBW）系统车辆进行研究，基于定横摆角速度增益法设计变传动比算 法，并依照系统结构与设计目的对算法改进修正。采用模拟退火算法，以郭孔辉院士提出的 操纵稳定性综合评价指标函数作为优化算法目标函数，对经验选取的定增益值进行优化，得 到全局最优定增益值。以全局最优增益值作为最终传动比算法设计依据。对所设计传动比算 法进行仿真分析，结果表明，采用优化后增益值传动比算法的 SBW 车辆具有更好的转向性能， 并有效减轻驾驶员的操作负担。

关键词: 车辆工程；模拟退火；线控转向；变传动比；操纵稳定性