Abstract: A mathematic model of one second vehicle about acceleration /braking system based on air suspension is established． By applying wheelbase preview control to forecast the road surface roughness at the front wheel，the optimal controller based on wheelbase preview control theory is designed． Then the simulation is implemented in the MATLAB/Simulink environment． The simulation results show that the performance of the active air suspension acceleration /braking system with a LQG controller based on wheelbase preview can effectively suppress vehicle vibration compared with the passive air suspension acceleration /braking system; and compared with the optimal air suspension acceleration /braking system，the active air suspension acceleration /braking system does well in improving the ride comfort of acceleration /braking system．

Key words: acceleration /braking system, wheelbase preview, optimal control, air suspension

摘要： 建立了基于空气悬架的1 /2 车辆加速/制动系统模型，通过轴距预瞄在后轮处提前预测路面不平度; 设计了基 于轴距预瞄控制算法的加速/制动最优控制器; 进行了白噪声仿真分析。仿真结果表明: 与被动空气悬架加速/制动 系统相比，基于轴距预瞄控制的主动空气悬架加速/制动系统能有效降低车辆振动。与最优控制空气悬架加速/制 动系统相比，质心加速度和后轮对应处的车身加速度、悬架动行程、轮胎动载均有显著减小，较好的改善了车辆在加 速/制动时的平顺性和操纵稳定性。

关键词: 加速/制动系统, 轴距预瞄, 最优控制, 空气悬架