基于AMESim乘用车转向制动稳定性分析

Stability Analysis of the Steering and Braking for the Passenger Vehicle Based on AMESim

当车辆在弯道制动时,由于制动力矩过大,轮胎与路面间的摩擦力难以克服离心力,车辆失稳将导致安全事故发生。本文基于AMESim建立车辆模型,以车辆行驶横摆角速度和质心侧偏角作为评价指标,进行车辆转向制动的动力学分析。在固定半径和制动车速行驶工况下,仿真分析了车辆的临界制动力;在固定制动力矩和转向车速工况下,仿真分析了转向盘的临界转角。研究结果表明:制动力、转向盘转角等均对车辆转向制动的稳定性产生影响,超过临界值,车辆将失去稳定性。

The friction between tire and pavement is difficult to overcome the centrifugal force due to the large braking torque when the vehicle is in cornering braking, and thus the vehicle instability will lead to accidents. This study established a vehicle model based on AMESim. Vehicle yaw rate and sideslip angle were used as the evaluation indexes to conduct dynamics analyses of the vehi-cle steering and braking. Under the condition of braking speed and fixed radius, the critical braking force of the vehicle was simulated and analyzed. The critical angle of steering wheel was simulated and analyzed under the condition of steering speed and fixed braking torque. The results showed that braking force and steering angle of vehicle have effects on the stability of steering and braking, and the vehicle will lose stability if they exceed the critical value.