A CPLD (such as epm7128lc84-15) is selected as the core component of the system to realize the function of control and processing. CPLD has the advantages of fast speed, easy programming, rich resources and short development cycle, which can be written and developed by VHDL. But CPLD has a bigger disadvantage than SCM in control. At the same time, the processing speed of CPLD is very fast, and the traveling speed of the car can not be too high, so the requirements for the system processing information will not be too high, at this point, MCU is already competent. If we adopt this scheme, we will meet many problems in control. For this reason, we do not adopt this scheme, and then put forward the second idea.