图1图2图3小车行驶的速度和小车行驶的距离都是小车的重要参数。在第五、六届全国大学生电子设计竞赛的小车类赛题中都有要求。其中,第五届赛题“自动往返电动小汽车”的要求为“距离为2m的D~E间为限速区,车辆往返均要求以低速通过,通过时间不得少于8s”、“自动记录、显示行驶 Figure 1 Figure 2 Figure 3 car speed and car travel distance are important parameters of the car. In the Fifth and Sixth National Undergraduate Electronic Design Competition car class questions are required. Among them, the fifth session of the title “automatic reciprocating electric car,” the requirement for the “distance of 2m between D ~ E is the speed limit, the vehicle are required to pass at low speed, passing time not less than 8s”, "automatic recording , Show driving