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10lA UTOMOTIVE 2008l SPECIAL EDITION FLEXRAY
COMBINING FLEXRAY SIMULATIONS WITH XCP ON FLEXRAY
FlexRay Applications
Under Control
Following the first successful use of FlexRay in a production application,
numerous further projects are presently approaching production level. The
test functions necessary for verifying these systems are made available by
test systems that have been successfully applied in many projects. Other
FlexRay functions in addition to ones for network verification also came
into operation. Along with FlexRay, the Universal Measurement and Calibration
Protocol, XCP, is also gaining in importance. This paper describes
the methods being used for FlexRay simulations and provides an XCP on
FlexRay application example.
Setting up a FlexRay Simulation
In-vehicle networks are in a state of constant further
development, particularly since the announcement of
FlexRay in the year 2000. dSPACE GmbH was one of the
companies that got involved in developing tools for Flex-
Ray at an early stage, in response to the need for comprehensive
means of testing the new bus system. Vehicles
have now been going into series production with
FlexRay for over a year, and further vehicles and applications
are just one step away from being launched on
the market. It is clear that FlexRay will continue to
advance rapidly.
As the number of applications grows, so do the requirements
on the necessary test tools and infrastructures. Building
on the experience gained from previous applications,
these tools must be given further test execution functions.
The dSPACE solution for testing FlexRay is based on
various hardware platforms and the FlexRay Configuration
Package. It already includes comprehensive test functions
that were also used in the first production project.
The dSPACE tool chain, with its real-time-capable simulation
platforms and with MATLAB/Simulink modeling facilities,
consists of several parts. The resulting workflow for
configuring a test system is shown in Fig. 1.
The dSPACE FlexRay Configuration Package is used to configure
a dSPACE system as simulation or monitoring nodes
in a FlexRay network. The nodes selected by the user are
configured with the dSPACE FlexRay Configuration Tool
according to a FIBEX communication matrix containing
scheduling information for signals and frames. Various
views help in managing the FlexRay configuration. The tool
uses the configuration to generate communication code
and parameters for the FlexRay controllers (called CHI
code). The communication information is extracted and