I. Introduction
With the development of automotive electronic technology, more and more electronic control and display unit is fitted to the bus. Together with the sensor and actuator, they form a number of sophisticated electronic control system. In order to transfer large amounts of data and exchange of different signals between electronic control systems on the bus vehicle. Vehicle interior network came into being. CAN (Controller Area Network, CAN); relying on its stability performance, low price and high reliability and real-time, has now been widely used in automotive internal network.