Vehicle electronics are becoming increasing complex and the number of functions, sensors, and actuators is growing fast. These requirements can only be met with a central control unit. The solution is to network the various electronic modules using a high-performance data bus. This makes it possible to reduce the complexity of the wiring and to make multiple use of sensor data in order to integrate the individual functions in such a way that they form an intelligent overall vehicle. A data bus system that is to be used in safety-related areas must satisfy the highest requirements concerning transmission rate, reliability and interference immunity. The data protocol must be fault-tolerant and deterministic, must feature excellent data integrity and must be compatible with the current background issues of automobile development. Good diagnosis capabilities for effective service demand flexible utilization of the bandwidth. Easy expansion capability is required to accomodate the rising number of functions. BMW has developed the byteflight high-performance data bus system which is presented in this article. At first, the data communication is described: 1. data transmission protocol, 2. FTDMA (flexible time division multiple access), 3. message structure, 4. redundant signal channel for the alarm status, 5. strategies for error handling. Available bus controllers, topology, development tools and test methods (byteflight development tools, byteflight conformance test), software structure, flexibility, gateway (networking with other data buses), examples of application) are discussed. The first use of bytefligth in mass production will take place at BMW within the next year in a networked passive safety system, into which body and convenience equipment functions have also been integrated.
A 10 Mbps communications system to network passive safety electronic control units
Ein 10 Mbps Kommunikationssystem zur Vernetzung von Steuergeräten für die passive Sicherheit
13 Seiten, 7 Bilder, 1 Tabelle, 10 Quellen
Conference paper
English
byteflight - A 10 Mbps Communications System to Network Passive Safety Electronic Control Units
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