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Why CAN FD?
Many CAN buses have reached 50% … 95% bus load level
1.Bus speed limited to 1 Mbit/s (typical ≤ 500 kbit/s)
Limited by physical characteristics of in-vehicle wiring due to the
In-Frame response mechanism:
ACK generation delay in CAN controller
Propagation delay through the transceiver
Propagation delay over wire
2.CAN messages contain ≥50% overhead
Other protocols have less overhead
Ethernet UDP – ~64 kbytes/datagram, 64 bytes overhead (IPV4)
FlexRay – 254 bytes/frame, 8 bytes of overhead
CAN_H
CAN_L
CAN-ECU
R
T
CAN-ECU
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