FlexRay

Mirabilis Design provides a modeling and simulation environments around the FlexRay and CAN bus network architectures.  The tutorial and white paper below helps understand the operation of FlexRay in general and to use the VisualSim model to analyze different conditions.  The model link provided above helps the user to fall through using the model Applet.  This link opens a separate Web Page where the interactive FlexRay model will appear. The user can click on the icons of the communication channel, nodes, star and the top-level parameters, modify them and execute the simulation.  This will enable the user to study impact on their architectures and to optimize the FlexRay parameters.  A list of analysis is provided below.

The Automotive Library contains the following components of FlexRay-

• Communication Controller
• Node
• Star
• Dual Channel
• Variety of Network topology examples including mesh,
• Example systems including rollover prevention in an Anti-lock Braking System (ABS).
• Traffic generators to activate the model and construct scenarios

The Automotive Library in VisualSim can be used to construct automotive network topologies and interconnect sub-system across this backbone. Architects can utilize the FlexRay Bus architecture model in VisualSim for validating the operation of a sub-system, evaluate performance for different FlexRay bus topologies, sizing an Electronic Control Units, or optimizing the FlexRay protocols for future revisions.  Architects can also use the FlexRay Bus model to optimize the FlexRay bus static and dynamic slot assignments in terms of number of slots and the size of slots that may be available from different vendors.   The FlexRay Bus Model is based on the FlexRay – Protocol – Specification – V2.1, 12May2005 release date.

The following analysis can be constructed using these models:

• Task Latency requiring data from multiple sensors and processed at an ECU
• Performance impact for different network topology or parameter configurations
• Determine the number of devices connected
• Performance vs. reliability trade-off by using the Dual Channel for additional bandwidth or redundant links.
• Create multi-system configuration to evaluate real-time performance impact of shared network topology and traffic loading.
• Size the over 35 variables of the FlexRay protocol such as number of slots slot size and node buffer
• Design protocol conversion algorithms and bus gateway between different speed FlexRay, CAN and in-system networks.
• Evaluate proprietary or alternate extension to the FlexRay standard such as BMW Byteflight™
• Evaluate system reliability by injecting an error into the channel or create downtime at a port

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