汽车高速公路横坡转向稳定性分析

Analysis of Automobile Steering Stability on Highway Transverse Slope

为分析某型汽车轴距和轮距设计值对横坡转向稳定性的影响,建立了在高速公路上横向坡道转向行驶的汽车转向动力学模型及仿真模型。其转向稳定性评价指标包括横摆角速度、侧向加速度、质心侧偏角等参数。通过仿真得到该型汽车以不同速度在不同横向坡道转向行驶工况下的评价指标参数时域响应;分析各评价指标参数响应的超调量、峰值、峰值响应时间以及该型汽车在高速公路横向坡道转向稳定性,以判断该型汽车轴距轮距设计是否符合转向稳定性。

To analyze the influence of wheelbase and wheel track design values of a designated automobile on steering stability at highway transverse slope,the steering dynamic model of automobile steering situation on highway transverse slope is established and simulated,whose evaluation index of steering stability includes yaw rate,lateral acceleration and sideslip angle.Through the simulation,the time domain response of the evaluation index parameters of the automobile steering conditions at different speeds and transverse slope with different transverse gradients are obtained.The overshoot,peak value and peak response time of parameter response of each evaluation index,and the steering stability of the automobile steering on the highway transverse slope are analized to determine if wheelbase and wheel track designs of the automobile meet the steering stability as required.