利用LQR对带两个拖车的卡车进行控制。控制能到达较好的效果。为了实时，具体的观察卡车运行的轨迹，本程序提供了简单的动画-The use of LQR trailer truck with two pairs of control. Control can reach better results. For real-time observation of a truck running on a specific trajectory, this program provides a simpl