Controller Area Network for Vehicle Automation

Based on requirements of modern vehicle, invehicle Controller Area Network (CAN) architecture has been implemented. In order to reduce point to point wiring harness in vehicle automation, CAN is suggested as a means for data communication within the vehicle environment. The benefits of CAN bus based network over traditional point to point schemes will offer increased flexibility and expandability for future technology insertions. This paper describes the ARM7 based design and implementation of CAN Bus prototype for vehicle automation. It focus on hardware and software design of intelligent node. Hardware interface circuit mainly consists of MCP2515 stand alone CAN-Controller with SPI interface, LPC2148 microcontroller based on 32-bit ARM7 TDMI-S CPU and MCP2551 high speed CAN Transceiver. MCP2551 CAN Transceiver implements ISO-11898 standard physical layer requirements. The software design for CAN bus network are mainly the design of CAN bus data communication between nodes, and data processing for analog signals. The design of software communication module includes system initialization and CAN controller initialization unit, message sending unit, message receiving unit and the interrupt service unit. Keywords—Vehicle Automation, Controller Area Network (CAN), Electronic Control Unit (ECU), CANopen, LIN, SAE J1939.