四路红外循迹小车，曾成功挑战多个复杂线路，稳定百分百不会跑出跑道且速度快，编程思路可供本科生参加电子竞赛参考。(The four-way infrared tracking car has successfully challenged many complicated lines. It is 100% stable and will not run out of the runway and has a fast speed. The programming ideas can be use