Automotive Semiconductors and Functional Safety
Which correctly describes a feature of the in-vehicle network FlexRay?
- AAn event-triggered scheme in which nodes contend for the right to transmit by ID priority, communicating inexpensively over a single signal wire at up to 20 kbit/s
- BA time-triggered scheme that divides time into slots and has each ECU transmit at a predetermined time; a redundant configuration using two channels of up to 10 Mbit/s each is also possible
- CA scheme that superimposes communication signals on power lines, eliminating signal wiring and making the vehicle lighter
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Answer: B. A time-triggered scheme that divides time into slots and has each ECU transmit at a predetermined time; a redundant configuration using two channels of up to 10 Mbit/s each is also possible
FlexRay is a time-triggered scheme that pre-assigns time slots for each ECU's transmission within the communication cycle, and is characterized by deterministic data delivery times. It runs at up to 10 Mbit/s per channel and can use two channels to send the same data in a redundant configuration, so it has been used for chassis control and similar applications. Contending for the right to transmit by ID is a feature of CAN, and a 20 kbit/s single wire is a feature of LIN. In new designs, migration to automotive Ethernet is also under way.
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