Vector Training Classes. This E-Learning module is also ideal for those planning to participate in the FlexRay workshop of the VectorAcademy. The FlexRay. Protocol. Philip Koopman. Significant material drawn from. FlexRay Specification Version , June 30 Nov © Copyright The FlexRay protocol Master Of Control Systems Wissam Kafa June 17,

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FlexRay is progocol used in a simple multi-drop bus topology that features a single network cable run that connects multiple ECUs together. The clock drift must be not more than 0. Conclusion The FlexRay communications network delivers the deterministic, flexraj and high-speed bus system performance requirements for the next generation of automobiles.

Clock synchronization and cold starting Figure Every FlexRay node is synchronized to the same clock, and each nodes waits for its turn to write on the bus. This can be done using two more more synchronization nodes. Back to Top 2. Back to Top 3.

Illustration of a static slot with ECU 2 missing. A short introduction into Vector’s FlexRay tools. Logic analyzers and bus analyzers are tools which collect, analyze, decode, store signals so people can view the high-speed waveforms at their leisure.

The ends of the network have termination resistors installed that eliminate problems with signal reflections. The dynamic segment operates more like CANwith nodes taking control of the bus as available, allowing event-triggered behavior.


While configurable for flexrray particular network, macroticks are often 1 microsecond long. Every FlexRay network may be different, so each node must be programmed with correct network parameters before it can participate on the bus.

FlexRay_E: Learning Module FlexRay

The frame is divided into three segments: Payload of a FlexRay Frame. Simplified Synchronization process of a FlexRay network.

By designing network configurations ahead of time, network designers save significant cost and increase reliability of the network. FlexRay is an automotive network communications protocol developed by the FlexRay Consortium to govern on-board automotive computing. This article needs additional citations for verification. While flexible and easy to expand, this technique does not allow for very high data rates and cannot guarantee timely delivery of data.

When you take one or more bits or bytes from a FlexRay frame, apply a scaling and offset, you get a signal that is useful for communicating actual parameters between ECUs. Adoption of a new networking standard in complex embedded designs like automobiles takes time.

FlexRay Automotive Communication Bus Overview – National Instruments

Articles needing additional references from January All articles needing additional references All articles with specifically marked weasel-worded phrases Articles with specifically marked weasel-worded phrases from April The Field Bus Exchange Format, or FIBEX file is an ASAM-defined standard that allows network designers, prototypers, validaters, and testers to easily share network parameters and quickly configure ECUs, test tools, hardware-in-the-loop simulation systems, and so on for easy access to the bus.

The network idle time is of a pre-defined, known length by ECUs. The green cells are sampling points.


From Wikipedia, the free encyclopedia. Termination is one of the most frequent causes of frustration when connecting a FlexRay node to a test setup. After years of partnership with OEMs, tool suppliers, and end users, the FlexRay standard has emerged as the in-vehicle communications bus to meet these new challenges in the next generation of vehicles.

Illustration of a static segment with 3 ECUs transmitting data to 4 reserved slots. Ethernet may replace FlexRay for bandwidth intensive, non-safety critical applications. Within the physical layer, FlexRay provides fast error detection and signaling, as well as error containment through an independent Bus Guardian.

FlexRay Automotive Communication Bus Overview

These can be any two separate nodes on the network that pre-designated to broadcast special sync frames when they are first turned on. This article covers the basics FlexRay. Much of what you have acquired by E-Learning will be revisited in the workshop, and this reinforces what you have already learned. Learning Module FlexRay FlexRay is a serial communication technology that is used in particular for data communication in very safety-critical use areas in the automobile.

The clocks are resynchronized frequently enough to assure that this causes no problems.