Background | Overview | Features | In-car Communication Protocol | Target applications | Data transfer method | Difference with CAN | Internal configuration of a node | Electronic signals | Bus Guardian | Topology | Segment configuration | Protocol | Status transition | Error control |
FlexRay
Background
Currently, CAN and LIN are widespread as global standard of in-car network that performs various kinds of controls of motor
vehicles. They are used for controlling body, temperature adjustment, dashboard, navigation, various kinds of sensors, motor,
and chassis. However, for motor vehicles of next generation, further safety and comfort are desired. Therefore, the amount
of data for in-car control system are increased and become more complex. Hence, faster and more highly reliable network is
needed.
Therefore, FlexRay, which is the communication protocol for the next generation motor vehicles, is now brought to international
attention.
What are needed for future motor vehicles?
For the motor vehicles of next generation, improvement of fuel efficiency by promoting ecology is needed. Supports for driving
are also need by improving comfort, for example, minimizing everything and realizing roomy car interior than it looks on the
outside. In addition, complex control system using multiple ECUs are required for improvement of safety.
To respond to such needs, we need to develop into more precise controls and further computerized in-car system, or to promote
X-by-Wire (*1).
*1 A technology that realize a mechanical control function, such as hydraulic pressure, by computerization
Why is a new communication protocol needed?
- CAN network limitation
The CAN network has reached its performance limits. A faster protocol is required. The maximum speed of a CAN network is 1 Mbps. - Real-time communication
Higher reliability and data rate are required. - Electrical control alternative to hydraulic control
Application of X-by-Wire to powertrain and safety systems is considered.
Fujitsu acquired a license to use FlexRay from Bosch in November 2004.
We have introduced the FlexRay Starter Kit (MB2005-01) that uses FlexRay IP and introduced ASSP that contains FlexRay IP in
September 2005.
In addition, since 2006, we have provided 32-bit microcontrollers equipped with FlexRay IP in the Fujitsu FR core.
Fujitsu also conducts the standardization activities as an associate member of FlexRay consortium, which is a standard setting organization, and as an official member of AUTOSAR and JasPar.
- Note -
Some parts on this site refer only to the outlines of the actual FlexRay standards providing better comprehensiveness.
