CAN - the short form of Controller Area Network, is a serial data communication bus developed by German Bosch Company in 1986 to solve the data exchange among so many measurement and control components in modern cars.

In engineering practice the CAN bus is the habit call in the car standard serial data transmission system. With more and more car electrical equipment, from the engine to control transmission system control, from traffic, braking, steering control system to guarantee security system and instrumentation alarm system, from power management to increase comfort and to make the various efforts, all make automotive electrical system form a complex large-scale system, and concentrate in the wheelhouse control.

According to statistics, one high-end vehicle using the traditional method of wiring, its length of wire up to 2,000 meters, electrical nodes of 1500 and, according to statistics, the number grows once about every ten years. Whether from the material cost or efficiency, the traditional routing methods will be unable to meet the development car.

From the perspective of information sharing, modern typical control unit is electronically controlled fuel injection system, electronically controlled transmission, Anti-lock Braking System (ABS), Acceleration Slip Regulation (ASR), exhaust gas recirculation control system and cruise Air-conditioning system. In order to meet the various subsystems of the real-time requirements, it is necessary to implement public car data-sharing, such as engine speed, wheel speed, throttle pedal position, etc. But each control unit on the requirements of real-time data varies due to the update rate and control of the cycle. This requires that its data exchange network is based on the prior competition model, and itself has a high rate of communication, CAN bus is designed to meet these requirements.