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1、 2013 . Vector Informatik GmbH. All rights reserved. Any distribution or copying is subject to prior written approval by Vector. V 1.0 2013-01-10 An Introduction CAN FD Flexible Data Rate CAN 2013 . Vector Informatik GmbH. All rights reserved. Any distribution or copying is subject to prior written
2、approval by Vector. Slide: 2 Agenda Why CAN FD? What is CAN FD? CAN FD Use Cases Automotive Application Domains CAN FD Frame CAN FD Controller CAN FD Performance CAN FD Devices CAN FD Standardization Tools and Hardware for CAN FD Tools, Hardware and SW Components for CAN FD References 2013 . Vector
3、Informatik GmbH. All rights reserved. Any distribution or copying is subject to prior written approval by Vector. Slide: 3 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
4、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
5、 bytes of overhead CAN_H CAN_L CAN-ECU RT CAN-ECU 2013 . Vector Informatik GmbH. All rights reserved. Any distribution or copying is subject to prior written approval by Vector. Slide: 4 Agenda Why CAN FD? What is CAN FD? CAN FD Use Cases Automotive Application Domains CAN FD Frame CAN FD Controller
6、 CAN FD Performance CAN FD Devices CAN FD Standardization Tools and Hardware for CAN FD Tools, Hardware and SW Components for CAN FD References 2013 . Vector Informatik GmbH. All rights reserved. Any distribution or copying is subject to prior written approval by Vector. Slide: 6 What is CAN FD? CAN
7、 FD is an improved CAN protocol (based on CAN 2.0) Two features added: Changes limited to CAN controller hardware 1.Support dual bit rates within a message Arbitration-Phase: same bit rate as standard CAN Data-Phase: bit rates up to 5 Mbit/s small software change needed (due to change of timing) 2.S
8、upport larger payload (data length) Up to 64 bytes/message larger software change needed 2013 . Vector Informatik GmbH. All rights reserved. Any distribution or copying is subject to prior written approval by Vector. Slide: 7 What is CAN FD? System cost similar to standard CAN Controller, crystal, t
9、ransceiver, node interconnection cost Existing CAN transceivers usable up to 2-5 Mbit/s depending on the application Well known technology: Event-Triggered system Smooth migration at reasonable cost possible Classic CAN and CAN FD ECUs can be mixed under certain conditions 2013 . Vector Informatik G
10、mbH. All rights reserved. Any distribution or copying is subject to prior written approval by Vector. Slide: 8 What is CAN FD? Scenario 1 Some nodes are not CAN FD capable: Communicate only with classic CAN messages or switch off the not-capable nodes (e.g. during flashing) Scenario 2 All nodes are
11、CAN FD capable: Classic and FD messages can be mixed Combining CAN and CAN FD 2013 . Vector Informatik GmbH. All rights reserved. Any distribution or copying is subject to prior written approval by Vector. Slide: 9 CAN FD Use Cases Use cases for CAN FD Faster software download Avoid split of data in
12、to several frames Decrease bus load of an existing bus Increase No. of ECUs on the bus Avoid split of networks Communication with ECUs with high data volume Accelerate communication on long bus lines (truck/bus) 2013 . Vector Informatik GmbH. All rights reserved. Any distribution or copying is subje
13、ct to prior written approval by Vector. Slide: 10 Automotive Application Domains Implementation cost Data rate Sensors CAN in Automation, iCC 2012, March 2012 Presentation “CAN FD CAN with Flexible Data Rate” Florian Hartwich, Robert Bosch, GmbH; Feb. 15, 2012 CAN with Flexible Data Rate Specificati
14、on Version 1.0 (Released April 17, 2012), Robert Bosch, GmbH; April, 2012 http:/www.bosch- semiconductors.de/en/ubk_semiconductors/safe/ip_modules/can_fd /can.html M_CAN Controller Area Network Users Manual, Revision 2.0.1, Robert Bosch, GmbH; March 12, 2012 2013 . Vector Informatik GmbH. All rights reserved. Any distribution or copying is subject to prior written approval by Vector. Slide: 42 Thank you for your attention. For detailed information about Vector and our products please have a look at: Author: Vector Informatik GmbH
