ECU is an electronic control unit, and in terms of use, it is a special microcomputer controller for automobiles. Like ordinary computers, it consists of a microprocessor (CPU), memory (ROM, RAM), input/output interface (I/O), module Converter (A/D) and large-scale integrated circuits such as shaping and driving are composed. With the increasing degree of electronic, intelligent and networked electric vehicles, the power, safety and environmental protection of electric vehicles have been greatly improved, and the number of electronic control units is increasing day by day. With dozens or even hundreds of ECUs, these ECUs are connected together through a digital bus structure to form a complex computer local area network.