Controller area network
- 2. Controller Area Network The Rise of the Automotive Intranet
- 4. In the Beginning… • Fred and Barney’s ride would have had ANALOG type gauges because they: • Were simple • Reliable • Cheap
- 5. In the Beginning… • Did I mention simple?
- 6. Functional, but no personality In a word, BORING
- 7. Electronics changed things… • But there were limitations Lots of wires, lots of connections, lots of troubles
- 8. And important information traveled S….L…O…W…L…Y…
- 9. Early Auto Comm Networks • GM Assembly Line Diagnostic Link (ALDL) – 160 Baud, might as well be handwritten notes • J1820 Serial Data – 10.4kb/sec one wire, 41.6kb/sec two wire. – Phone modems are faster • ISO 9141 – Used by Chrysler, European, Japanese – 56.6kb/sec modem still beats it by a mile • Slow speeds prevent fast data transfer
- 10. Enter Controller Area Networks
- 11. Controller Area Networks features • All inputs and outputs to CAN system share a common circuit, think of a race track • CAN circuit is two wire, twisted pair of wires to reduce electrical interference • CAN L is low speed circuit at 250kb/sec, used for body control functions • CAN H is high speed circuit at 500kb/sec. used for engine, trans, ABS, SRS controls • CAN system will function if one wire damaged
- 14. Controller Area Networks Different type of CAN: Car and Automotive Network
- 22. Can you think of an example of a Wireless network in a car?
- 23. Wireless? • OnStar (GM) • Global Positioning System • Blue Tooth • Blue Connect • Personal Data Assistant • Tire Pressure Monitoring System • Smart Key • FUTURE?
- 24. TPMS
- 25. Toyota Smart Key
- 26. Toyota Smart Key