基于xPC的电动汽车自适应巡航控制半实物仿真

Semi-physical Simulation of Adaptive Cruise Control for Electric Vehicle Based on xPC

针对电动汽车自适应巡航控制(ACC)较高的实时性要求,设计了半实物仿真系统,在宿主机Matlab/Simulink RTW平台下建立了电动汽车数学模型,并将其转化为C代码下载到目标机中模拟真实车辆;采用DSP2812嵌入式计算机作为车辆自适应巡航实物控制器,针对不同工况切换控制算法,在线调节车辆速度,以实现定速巡航或等距跟踪前车。实验结果表明:巡航控制算法对前车急剧变化的工况有很好的自适应能力,能有效避免追尾;提高了对巡航速度的跟踪能力,保证行驶安全性及舒适性。

For the high real-time requirements of adaptive cruise control for electric vehicle, a semi-physical simulation platform was designed, and a mathematical model of electric vehicle was established in the Matlab/Simulink RTW platform of host machine. Furthermore, it was translated into C code and then downloaded to the target model machine for simulating the real vehicle. An embedded computer of DSP2812 was used as the adaptive cruise physical controller of vehicles to swith control algorithm for different working conditions and adjust vehicle speed online, so that the constant speed drive or isometric tracking for front vehicles could be realized. Experimental results show that the cruise control algorithm has good adaptive ability for front vehicles changing rapidly, and can avoid collision effectively and improve tracking ability of cruising speed, which ensures driving safety and comfort.