Development of a Digital Vehicle Instrument System Based on In-Vehicle Network

With the increase of the number and complexity of city bus electronic control units, a flexible vehicle instrument system based on in-vehicle network with high reliability was designed and implemented on a new type of natural gas city bus. The instrument system adopts HCS12 embedded system, CodeWarrior development platform, Vspy3 diagnosis software and modularization design method. An information module based on in-vehicle network and a digital stepper motor panel is included in the system, which can realize real-time monitoring and fault diagnosis through bus interface via Vspy3. Compared with traditional vehicle instrument system, the system has been proved to be more effective and reliable through road driving test.