Vehicle-Bus Interface with GMLAN for Data Collection

Within a few years, nearly every vehicle that General Motors (GM) manufactures will have a microcontroller network known as GMLAN. A few GM vehicles already have the GMLAN network, and more vehicles with GMLAN will appear each year. GMLAN uses the Bosch-designed CAN (Controller Area Network) protocol, and it links all of a vehicle’s various processors or nodes to form an in-vehicle data network. CAN uses a Non-Return-to-Zero protocol, NRZ-5, with bit stuffing, and the network implements Carrier Sense Multiple Access with Collision Resolution (CSMA/CR). GMLAN actually includes two linked CAN buses: a high-speed dual-wire CAN for high-speed nodes and a lower-speed single-wire CAN for other nodes. The primary purpose of the GMLAN network is to improve reliability while simultaneously lowering cost by reducing the numbers of wires, connections, and special-purpose circuits in a vehicle. The GMLAN network also promotes synergism among the vehicle nodes to provide vehicle features that wo...

• Type: Conference
• Year: 2003
• Where: CATA
• Authors: David C. Pheanis, Jeffrey A. Tenney
• Keywords: CATA 2003, CATA 2007, GMLAN Network, Vehicle, Vehicle’s Various Processors