Car running is a very complicated process, although we basically depends on the brake and accelerator control at ordinary times, but every time there are hundreds of thousands of parts in close cooperation, and automotive can accurately grasp the movement, mainly by all kinds of sensors to monitor the operation data, the analysis to the ECU, the ECU orders automatically if there is deviation adjustment, such as engine fuel injection advance Angle and speed data are collections of objects. What if the ECU's little helper sensor doesn't work?